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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed55f278609349724637f62b348eb0940a9aa0c6ced567c92b7f59328785262' 
  AND token = 'nM4UuMwcnaYrNkiOw4glJ70OU5OWa13KiS5SqHp3hY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}